How scientific is the polygraph (lie-detector) test?

Answer 1

It's not scientific at all. One test to any claim of science is "replicability." For something to be scientific, multiple people looking at the same phenomena should all agree on what they're seeing. If you take one polygraph chart and bring in a dozen socalled "experts" you'll get several different conclusions. Some will say the person is lying, some will say the person is telling the truth, and others will say the results are ambiguous.

All to many times this test of Polygraph replication has been done, and the results are the same. The socalled experts cannot agree on what they're seeing. This is why Polygraphs cannot be used in courts of law. They are inadmissable because they aren't scientific.

By law, certain security organizations like the CIA have been permitted to use them; but that's because they're cureently isn't anything better. Although -- voice stress analysis may prove more reliable in the long run.

Answer 2

The polygraph is a device that measures and records several physiological variables such as blood pressure, pulse, respiration and skin conductivity (galvonic skin response) while the subject is asked a series of questions. The measurements are posited to be indicators of anxiety that accompanies the telling of lies. Thus, measured anxiety is equated with telling untruths. However, if the subject exhibits anxiety for other reasons, or can control his anxiety level voluntarily, a measured response can result in unreliable conclusions. A polygraph test is also questionably used as a psychophysiological detection of deception (PDD) examination.

Answer 3

for sure the "pyramid-formed container" "hazard free yet stunning pop of sparks" had no longer something to with Evelyn's reaction. it additionally should be stated that those experiments weren't performed with something with regards to technology, different than that they have got been experiments of a sort. there have been no controls, no double blind tests and no autonomous verification or inspection. At this factor little or no clarification is mandatory till the "experiments" could be repeated in a creditable way. Edit: it is no longer likely that the 4 3 hundred and sixty 5 days olds have been in on the hoax, Playfair is a thoroughly distinctive remember.

Answer 4

Polygraph exam results are NOT admissable in a court of law. What does that tell you?

Answer 5

About as scientific as "An Inconvenient Truth".

Answer 6

I have read that it works over 90% of the time but false readings can be induced if someone practices

Answer 7

well it uses science, since it measures various body responses.

But it is not reliable and is not acceptable in criminal trials. It is still used in private business and in some civil cases.

There are many reasons for false reports

Answer 8

I think it's a joke. I mean cmon, people are going to be nervous even if they did nothing wrong and the test is going to show they failed!

Answer 9

very much. about the processes of the body. it measures changes in heartbeat, breathing, blood pressure, sweating, voice, etc. that could be affected by telling a lie. very accurate but not 100% reliable though.

Answer 10

Very.. If you mean "sientific" as "relyability"
Then its a 70% truth.
People can trick it with many ways.

But it measures your heart rate, and how nervous you get per question.